The problem with cheap mailers
If you've ever shipped something in a thin plastic envelope and it arrived ripped open, you already know the problem. Cheap mailers tear. They tear when you stretch them over an oddly shaped item, when they get caught in a sorting machine, or when someone just handles them a little too roughly. And when that happens, your product — and your brand — pays the price.
So what actually makes a mailer tear-resistant?
Two things: the material and the thickness.
The material matters because not all plastics are equal. LDPE (Low-Density Polyethylene) is specifically good at stretching without breaking. It bends, it flexes, it gives — and then it springs back. That's why it's the go-to material for courier mailers. Other plastics, like PVC, are stiffer and crack more easily under pressure.
The thickness matters because a thicker film simply takes more force to tear. At 55μm (0.055mm), you get a mailer that can stretch around your product without splitting, survive being tossed into a bin at a sorting facility, and still be light and flexible enough to fold flat for storage.
What does "tear-resistant" actually mean in the real world?
It doesn't mean bulletproof. It means the mailer is designed to handle the normal stress of courier logistics without failing. That includes:
Being pulled and stretched when you seal it around your item. Getting pressed and stacked under the weight of other packages. Passing through automated sorting machines that grip and move envelopes at speed. Being handled by human couriers who aren't always gentle.
A 55μm LDPE mailer handles all of that without tearing under normal conditions. A 25μm mailer from a budget supplier? It probably won't.
How can you test it yourself?
Simple. Take the mailer, put something inside it, and try to pull it apart with your hands. A good tear-resistant mailer will stretch significantly before it gives. You should feel real resistance. If it tears easily with moderate pulling, it's not going to survive courier handling either.
Does tear resistance affect recyclability?
No. Tear resistance comes from thickness and material type, not from additives or coatings. A 55μm LDPE mailer is just as recyclable as a thinner one — it's still plastic code 4, accepted at most recycling facilities in Poland and across the EU.